Let A = {x: x is a digit in the number 3591}, B = {x: x ? N, x<10}. Which of thefollowing is false?

• A. A? B = {1,3,5,9}
• B. A U B = {1,2,3,4,5,6,7,8,9}
• C. none of these.
• D. A-B = {2,4,6,7,8}